zcat won't unzip files properly

I need to unzip a compressed file on the fly in my program. It works when I try it on my own linux computer, but for some reason the school computers fail whenever I tell them to do it. To unzip I'm using the following command: zcat /file/address/file.tar.gz and get the error: /file/address/file.tar.gz.Z: No such file or directory I tried looking through the documentation but couldn't find a flag

[oxon]

cfitsio で gzip かけたものは、zcat じゃなくて gzcat じゃないと駄目だった